Datasmith exporter for Rhino 8 - An unexpected error has occurred

Hello,

i keep getting the following error message when trying to sync datasmith on Rhino 8:

An unexpected error has occurred:
System.IO.FileNotFoundException: Could not load file or assembly ‘System.Threading.Tasks.Parallel, Version=8.0.0.0, Culture=neutral, PublicKeyToken=xxxxxxxxxxxxxxxx’. Impossibile trovare il file specificato.
File name: ‘System.Threading.Tasks.Parallel, Version=8.0.0.0, Culture=neutral, PublicKeyToken=xxxxxxxxxxxxxxxx’
at DatasmithRhino.ElementExporters.IDatasmithRhinoElementExporter2.SynchronizeAsynchronously() at DatasmithRhino.ElementExporters.IDatasmithRhinoElementExporter2.SynchronizeElements(FDatasmithFacadeScene InDatasmithScene, DatasmithRhinoExportContext InExportContext)
at DatasmithRhino.DatasmithRhinoSceneExporter.SynchronizeScene(DatasmithRhinoExportContext ExportContext, FDatasmithFacadeScene DatasmithScene)
at DatasmithRhino.DatasmithRhinoSceneExporter.ExportScene(FDatasmithFacadeScene DatasmithScene, DatasmithRhinoExportContext ExportContext, Func`2 OnSceneExportCompleted)

Does anyone have a clue?